<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react资料_stu//依赖包/react.development.js"></script>
    <script src="../react资料_stu//依赖包/react-dom.development.js"></script>
    <script src="../react资料_stu//依赖包/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>
    <script type="text/babel">
        class App extends React.Component {
            state = {
                count: 0,
                isHot: true,
            }

            render() {
                console.log('---render---');
                const { count ,isHot} = this.state;
                return (
                    <div>
                        <button onClick={this.handle}>+</button>
                        <p>{count}</p>
                        <button onClick={this.changeWeaHandle}>切换天气</button>
                        <p>{isHot?'热啊':'冷啊'}</p>
                    </div>
                );
            }
            // 事件函数
            handle = () => {
                //组件实例上有一个setState方法,接受一个对象,会把接受的对象和原有的state对象进行合并,并重新渲染
                //千万不要直接修改state,而是使用setState 
               let {count}=this.state;
               this.setState({count:++count})
            //    this.setState({count:count+1})

                
            };
            changeWeaHandle=()=>{
                const {isHot}=this.state
                this.setState({isHot:!isHot})
            }
        }
        ReactDOM.createRoot(document.getElementById('app')).render(<App />)
    </script>
</body>

</html>